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Question :
What is the number of water molecules contained in drop of water weighting 0.06g!
Answer :
Weight of water drop = 0.06
We have to find number of water molecules
★ First of all we need to find moles of water.
Mole is defined as the ratio of weight of substance to the molecular weight.
Molar weight of water :
➝ 2(H) + 1(O)
➝ 2(1) + 1(16)
➝ 2 + 16
➝ 18 g/mol
Moles of water :
⭆ x = w/m
⭆ x = 0.06/18
⭆ x = 0.0033
We know that, one mole of substance contains 6.022 × 10²³ molecules.
➝ n = x × (6.022 × 10²³)
➝ n = 0.0033 × (6.022 × 10²³)
➝ n ≈ 2 × 10²¹ molecules .
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